The Edge of Space
Where does space begin?For purposes of spaceflight some would say at theKarman line,currently defined as an altitude of 100 kilometers (60 miles).Others might place a line 80 kilometers (50 miles) above Earth’s mean sea level.But there is no sharp physicalboundary that marks the end ofatmosphere and the beginning of space.In fact, the Karman line itself is near the transition between theupper mesophere and lower thermosphere.
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